num1,operation,num2,output,flag
0,,0,0,wrong sign
0,,0,0,wrong sign
0,,0,0,wrong sign
0,,0,0,wrong sign
0,,0,0,wrong sign
0,,0,0,wrong sign
0,,0,0,wrong sign
0,,0,0,wrong sign
0,,0,0,wrong sign
0,,0,0,off by one
0,,0,0,wrong sign
0,,0,0,wrong sign
0,,0,0,wrong sign
0,,0,0,wrong sign
0,,0,0,wrong sign
0,,0,0,wrong sign
0,,0,0,wrong sign
0,,0,0,wrong sign
0,,0,0,wrong sign
0,,0,0,off by one
0,,0,0,other
0,,0,0,wrong sign
0,,0,0,wrong sign
0,,0,0,wrong sign
0,,0,0,wrong sign
0,,0,0,wrong sign
0,,0,0,wrong sign
0,,0,0,wrong sign
0,,0,0,wrong sign
0,,0,0,wrong sign
0,,0,0,wrong sign
0,,0,0,wrong sign